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Well blow me down! An update on Bad Horn- let there be light!


Taigatrommel

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Well, I might have not made any entries on the blog recently, but I have been working on both my layouts. The progress hasn't been rapid for a variety of reasons, not least the eternal wait for supplies ordered. Two weeks lost while the layout room was occupied by guests didn't help, plus a trip to Oz with Kev Prince.

 

The bulk of my work has been electrical, with a control panel being built and Viessmann signals installed. While I thought I'd had an epiphany into the signalling practices a while back, somehow when I came to fitting the signals I had a lot of doubt in my mind. The only thing I was really certain about is that the headshunt at the end of the platform (not visible in the pics below) wouldn't have a signal other than a points indicator. I took the cowards way out and put full departure signals including shunt aspects on every road a train could be expected to leave from- the centre road is just for running around trains, and so a shunt signal will suffice here. Likewise the headshunt visible in in the following images.

 

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All signals at Sh0 or Hp0 (stop) except for the centre departure signal which shows Sh1 (shunting permitted)

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The centre signal now shows Hp2, restricted speed (40km/h).

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And finally Hp1, full line speed permitted.

Control is by an analogue switch panel, with knobs for selecting the aspect on the departure signals. I think that the left and right departure signals in the above pictures should only show Hp0, Sh1 and Hp2, but what the heck. A faulty switch means that the one on the right can't show Hp1 anyway, so that's sort of correct. I used diodes to allow the correct aspects to display with simple switching, as Hp0 & Sh1 and Hp1 and Hp2 have common lights. When AC supply as recommended by the instructions, I got unwanted lights faintly displaying, this disappeared with DC power. Checking my circuits I wonder if I have poor quality diodes! Anyway, the control panel is illustrated below. Nice and simple, although I'd like interlocking it made my brain hurt too much. It wouldn't be so bad with computer control, but I just didn't want that. It doesn't feel right for a branch line terminus that would be controlled by a local box.

 

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Anyway, I'm happy, it's fantastic to see all the signals lit and controlled. I don't need any trains now, I'll just imagine and signal them as they move in my head!

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That does look good, Rich! :) One bit of disambiguation, though, if I may: The Hp 2 aspect may be shown for all restricted speeds up till 60 kph, though it does indicate a 40 kph limit with no additional information concerning the permitted speed. If such additional information is given, it may be in the shape of a Zs 3 speed indicator (which in turn may be a simple plate or the illuminated variant, the latter of which could also show different limits for all routes the signal can cover) co-located with the home signal or a written notice in the driver's working timetable.

 

There also is something to consider with regard to the Sh 1 shunting signal: In German signalling practice, train and shunting movements are treated differently from one another, and shunting movements generally are subject to a 25 kph speed limit - except in those cases where the signalman is able to provide a clear route for the shunting movement from start to its destination, which is referred to quite simply as "freier Fahrweg". If he is, he may inform the driver accordingly, following which the latter may operate at 40 kph for the duration of the movement. This "freier Fahrweg" thing thus is not signalled separately, but you might still find it helpful when doing some shunting, as it might allow you to imitate different shunting situations and control your locos accordingly.

 

And just for the sake of completeness - can the signals you use also show the Zs 1 aspect (three white lights in an upright triangle)? I do see the supplementary head for it below the main head, which is why I'm asking.

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Hi Dominik,

 

The Zs1 doesn't light up, not a big problem really as its not needed in day to day use. It'd be an interesting one to use, but to be honest, if a signal failed, it would be easier to replace the whole thing than try to fit lights to the Zs1! For anyone reading who wonders what Zs1 is, it's a subsidiary used when the main signal head has failed, and indicates that the signal is safe to pass. If anyone is interested in German railway signalling, I'll again give a link to Wolfgang Meyenberg's Sh1.org german railway signalling website. It's in English, and an excellent resource.

 

I don't thing the "freir Fahrweg" will really be in use on Bad Horn as all shunt moves will involve reversals, so there's not really any possibility of a clear run from start point to end point!

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Hello Rich,

 

okay - I was just thinking it might add yet another bit in operational variety if the Zs 1 were functional. However, far as I am aware few German H0 scale signals have the Zs 1 (or Zs 7) cluster in functional shape.

 

Hm - now I introduced yet another signal aspect. The Zs 7 signal I just mentioned is, on the whole, similar to the Zs 1, but consists of three yellow lights in an upside-down triangle. Like the Zs 1, it serves to permit a train to pass a failed main, but mandates that the train proceed "on sight". In practice, this means that the speed may not exceed 40 kph, but must be reduced in adverse visual conditions to ensure a safe stop in case the driver spots any sort of obstacle - as low as to walking speed, if required.

 

I can't tell for sure how long the tracks will extend beyond the station limits, but one other suggestion I'd like to make would be to place Ra 10 shunting movement limit marker plates (Click) beyond the station limits, at a distance appropriate for whichever train length you would think may occur on shunting movements. Likewise, I think the Ra 12 clear of points markers would look good as well.

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Hi Dominik,

 

Ra12s are a must, I have some amongst the Erbert points detailing parts. I've yet to put the signal trunking in as well, but I should have done that before ballasting really. Ra10 would be well beyond the scenic break, along with the entry signals, so not one I have to worry about.

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Aside from those provided on several RTR points - especially with moulded-on ballast - I cannot think of any off the top of my head, but I'll let you know if I should find anything. The only thing I did come across during a quick search was a DIY guide for building one, using a, indicator housing from one of Roco's RTR points and various other bits and pieces: http://www.hr-modell...tips_ideen3.htm . The idea here would seem to be powering it with a separate Tillig points motor.

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The box was from Jaycar electronics, the local equivalent of maplins. You can sort of see in the pics of the signals that it has a sloped top- in a moment of cunning I built the switch panel into the bottom of the box, so that it could be turned around to slope towards the operator whether in front of (as at home) or behind (as at exhibition) the layout. It's brittle blooming plastic though- even with sharp drill bits and a succession of pilot holes shards of plastic came off leaving untidy holes. Luckily the switches hide that!

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By the way, another bit of signalling trivia - though it may not be valid for the period Bad Horn's going to represent: The network branch of Deutsche Bahn is currently placing additional speed signs all over the country as it was decided these are not to be used only for indicating line speed reductions relative to the currently allowed speed, but also for relative speed increases - which drivers could determine only from the working timetables thus far. I've seen several of these signs myself, though they are usually wrapped in plastic bags at this time as the order for them to be valid has not been issued yet.

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